↑ Biography on Wikipedia of Ælfthryth, in Wikipedia, found 2016, Secondary quality.

Edgar married Ælfthryth in either 964 or 965. In 966 Ælfthryth gave birth to a son who was named Edmund. In King Edgar's charter (S 745) regranting privileges to New Minster, Winchester that same year, the infant Edmund is called "clito legitimus" (legitimate ætheling), and appears before Edward in the list of witnesses. Edmund died young, circa 970, but in 968 Ælfthryth had given birth to a second son who was called Æthelred.